Could you play as a droid in MP? that'd be funny. Also if you have more than 2 teams, you could have commandos, droids, and trandos. but maybe not playing as a droid on second thought... now that i think of it. what about jacking a droideka? shield bonus, maybe? like for MP...
Commando 127-09, Pfc. Jieulu, reporting for duty, sir. Awaiting orders.